docs: def _construct_linebreak_token(self, d: Dict) -> List[Dict]:
          """
          Construct a shape token
          Args:
              d: Dict
  
          Returns: List[Dict]
          """
  
          result = []
          num_break = int(d["length"][0]) if d["length"] else 1
          if num_break:
              s = ''
              for i in range(num_break):
                  s += '\n'
              this_token = {attrs.LOWER: s}
              result.append(this_token)
              s += ' '
              this_token = {attrs.LOWER: s}
              result.append(this_token)
          result = self._add_common_constrain(result, d)
  
          return result